Twyer



s. P. TO- LMAN & N. F. BLODGETT.

TWYER FOR BLA'GKSMITHSFORGES. Y

Patented July 10, 1860.

WWW/W7 UNITED s'rA'rEs PATENT OFFICE.

SEWALL P. TOLMAN AND NATHANIEL F. BLODGETT, OF NORTH ORANGE,MASSACHUSETTS.

TWYER.

Specification of Letters Patent No. 29,114, dated July 10, 1860.

To all whom it may concern:

Be it known that we, SEWALL P. TOLMAN and NATHANIEL F. BLODGETT, ofNorth Orange, in the county of Franklin and State of Massachusetts, haveinvented an Improved Twyer for Blacksmiths Forges; and we do herebydeclare that the same is fully described and represented in thefollowing specification and the accompanying drawings, of which- Figurel, is a top view; Fig. 2, a side elevation; Fig. 3, a longitudinalsection and Fig. 4, a transverse section of it.

The nature of our invention consists in an improved twyer, asconstructed with a valve opening and valve arranged in or applied to theair case, so that the valve shall not only close upon its opening by theforce of the blast from the induction pipe but on cessation of suchblast move away from and uncover such opening, and allow air to passthrough it into the case.

In the drawings, A, denotes the air case or box, furnished with a blastpipe, B, and a cap plate or hearth, C. The said part, C, is providedwith three elongated slots, 6, Z), Z), arranged parallel to each otherand in nipples or projections, 0, extending upward from the hearth.

Underneath each hole, 6, there is a separate slide, (Z, arranged in thecase so as to be capable of being moved back and forth in a longitudinaldirection and so as to open or close its hole, 6, to such extent ascircumstances may require. Furthermore, the bot tom, f, of the air caseA, is made so as to slide into grooves, g, g, in order that bywithdrawal of the bottom at any time, the ashes or cinders which mayhave collected in the case may be discharged therefrom.

Through one side of the case, A, there is an air hole or passage, 71,having an inclined valve seat, 2', where it enters the interior of thecase, the inclination of such seat being as shown in Fig. 4:. To theupper edge of this valve seat, a light valve In is hinged so that whilehanging vertically, it may not lie close upon the seat but awaytherefrom so as to permit air to pass through the hole, h, and into thecase.

By means of the series of long holes and sliders applied to the hearthof the case, the blast may be made to rush through either a part or thewhole of a mass of fuel when resting on the hearth. In this way, eithera narrow or broad fire may be maintained, according as the smith mayrequire, it often being necessary, especially when a broad and flatpiece of metal is to be heated to have a wide fire.. The series ofsliders and their air ducts also enables the smith to direct the blastupon such part of the fire as he may desire.

Vhile the blast from the bellows is being driven through the pipe, B,and into the case A, its force will close the hanging valve, is, downupon its seat but as soon as the blast may cease the valve will open andfall away from its seat and allow sufiicient air to maintain combustionof the fuel to pass through the opening, it, and into the case, A, fromwhich it will flow through either one or all tfhe1 hearth passages andinto the mass of lVith ordinary twyers the fires of their forges are aptto become extinguished from want of oxygen after cessation of the blast,but with our improved twyer constructed with a lateral air passage and aself acting valve air will be supplied to the fire when the blast is notin action thereon.

Ve do not claim a twyer, having a series of air discharging ducts in itshearth and but one valve to all of them, or with valves or slides soconnected that one cannot be moved without creating a like degree ofmovement of the other, for in our improved twyer, each slide is separatefrom and independent of the other, and can be kept closed more or lesswhile either of the others is being moved or is open more or less. Theseparate and independent slides afford great advantages in applying theblast to the fire.

We claim The improved twyer, as constructed with a valve opening, it,and valve, 76, arranged on or applied to the air case so that the saidvalve shall not only close upon the opening by the force of the blastfrom the induction pipe, but on cessation of the blast move away fromsuch opening and permit air to enter the case and pass from thence intothe mass of fuel.

SEVVALL P. TOLMAN. NATHANIEL F. BLODGETT. Witnesses PERoIvAL BLODGETT,DOLLY A. BLODGETTV

